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## Homework Statement

Explain why we observe bright and dark fringes behind two thin slits illuminated by monochromatic light?

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- Thread starter Libra_girl
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- #1

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Explain why we observe bright and dark fringes behind two thin slits illuminated by monochromatic light?

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Google for youngs double slit experiment :)

- #3

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( I don't have 15 posts yet thus I can't copy paste the link )

google for "young's double slit experiment" and click on the second link

If you still need help on this one, let us know

- #4

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lambda / d = x/ L

d is distance between slits, lambda is the wavelength of monochromatic light, x is distance of first bright fringe from central maxima, L is distance of screen from the slits.

a bright fringe is obtained where the path difference between the light from the two slits is an integral multiple of lambda. so where

path diff = n.lamda .. bright fringe is obtained.

and when path difference is (2n-1).lambda/2 .......a dark band is obtained.

- #5

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( I don't have 15 posts yet thus I can't copy paste the link )

google for "young's double slit experiment" and click on the second link

If you still need help on this one, let us know

lambda / d = x/ L

d is distance between slits, lambda is the wavelength of monochromatic light, x is distance of first bright fringe from central maxima, L is distance of screen from the slits.

a bright fringe is obtained where the path difference between the light from the two slits is an integral multiple of lambda. so where

path diff = n.lamda .. bright fringe is obtained.

and when path difference is (2n-1).lambda/2 .......a dark band is obtained.

Google for youngs double slit experiment :)

Thank you all.

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